Stephanie Seymour, a top model in the ’80s and ’90s, passed on her gorgeous genes and a passion for makeup to her sons.Clint Spaulding/PatrickMcMullan.com

For the uninitiated, the Brant Brothers — Peter Jr., 21, and Harry, 19 — are the sons of supermodel Stephanie Seymour and mogul Peter Brant, and they’re the dandiest social butterflies in all of New York City. With porcelain features and blue steel gazes, the pair are known as much for their style as they are for their busy party schedules.

So it’s only natural they’d team up with MAC cosmetics to curate a makeup collection. We asked the siblings about their love of cosmetics and what their famous mom taught them about beauty. The inseparable brothers answered together via email.

Does your mother give you beauty advice?
Of course. Like any kid using makeup, you need to be corrected when you’re not using it properly. She definitely helped us to learn to achieve a natural look. We grew up watching her do her makeup. She even used to let us do hers sometimes. That’s why we associate beauty with fun. We can’t describe how much fun we had with our mom in her dressing room, talking and exploring makeup. She’s our ultimate beauty icon and inspiration.

Who, besides your mom, are your beauty idols and why?
Linda Evangelista and Naomi Campbell. Not only because they’re [like] family to us, but because they are so skilled in the art of makeup and have a unique understanding of their own faces. Until the mid- to late-eighties, models mostly did their own makeup for runway. You really had to be a professional makeup artist, as well as a model, if you wanted to look good, and no one looked better than them.

Was doing this more like fun or work?
This has really been like our baby. Working on this collection has been the world’s most epic after-school activity.

Who is your target customer?
The individual who is not afraid to express themselves with beauty, or simply use it to subtly enhance, regardless of gender.

What are your makeup routines from start to finish?
We try not to talk about our beauty routines in such detail because we feel it ruins the mystery. Makeup should be an illusion. Furthermore, our routines involve lots of different products and tricks, but used with minimal application. If we explain it in detail, people assume we wear as much makeup as Marie Antoinette, which is not the case.

Do a lot of people ask about your beauty routine and how to achieve your flawless skin?
People ask us a lot about how we get our skin to look the way it does, and it’s generally meant in a flattering manner, but there’s this implication that we’ve cheated by being boys and wearing makeup, instead of seeing it as a form of self-expression.

As far as the actual products we use on our skin, it’s been a battle to get rid of acne, so we’re no strangers to harsh products, and typically use benzoyl peroxide and salicylic acid-based products to get clear complexions.

What is the one product that you can’t live without?
Highlighter! We love the wet effect it brings. It’s as if you’ve been sprinkled by morning dew.